A Raman laser intensity sensor induced by the cooperative Rayleigh scattering in a ring configuration |
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Authors: | Baptista J M Correia C Marques M B Frazão O |
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Institution: | 1.INESC Porto, Rua do Campo Alegre, 687, 4169-007, Porto, Portugal ;2.Centro de Ciências Exactas e da Engenharia, Universidade da Madeira, 9000-390, Funchal, Portugal ;3.Departamento de Física, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007, Porto, Portugal ; |
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Abstract: | In this work, a laser sensor is described that uses the multipath interference produced inside a ring cavity to measure the
power loss induced by a moving taper intensity sensor. The laser is created due to the virtual distributed mirror formed by
the Rayleigh scattering produced in a dispersion compensating fiber when pumped by a Raman laser. Two laser peaks were formed,
one of them is obtained by the Raman gain (1555 nm) inside the ring and the second is created by the combination of the Raman
gain and the Rayleigh scattering (1565 nm). A taper sensor is used as displacement sensor and when the losses is applied in
the taper the second laser peak is reduced and the first peak is maintained constant and can be used as reference level. |
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Keywords: | |
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